A few hours later the father comes home and the mother says, "Go up to your son's room and talk to him. He's been really bad today."

Dad goes up to the son's room and asks why Mom is so mad. "I told her I had sex with my teacher today," replied the boy.

"All right! That's my boy!" says Dad. "Ya know son, women just don't think like men. But I'm proud of you. What are you now, about sixteen, right? Wow. That's my son! Ya know what? I'm so proud of you I'm gonna take you out and buy you that new shiny bike you've been wanting."

So the dad and his son go out and buy the nicest, reddest, shiniest bike in the whole town. "You gonna ride it home son?" asks Dad.